Malicious PDF — malware analysis report

Static analysis result for SHA-256 326972b4cb45c105…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 01:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b04d73f33236a1e4162bf2394d27ee22 SHA-1: 081ec8656a790c33197a6fe56880ed2068b8ab40 SHA-256: 326972b4cb45c1051a90bc0984139dafaf3ec1b6a5949f3ac20e7c1f654bba9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links strongly suggest it is used as a lure, likely for phishing or to distribute further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://baggiez.net/userfiles/file/25221844657.pdf In PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/20119560275.pdfIn PDF document text
    • http://vladekoservis.ru/files/44542236514.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/gevifibubajule.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/942bqn7as7akkf8de608s97qo1/zurugaxexil.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/wevurafovaxufaxexajadeg.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210909050415.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xusuvakanumowewirobeku.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6bec63f---89085710860.pdfIn PDF document text
    • http://kmsenior.org/file/files/87117285105.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fixugedumododagimaduto.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/nofen.pdfIn PDF document text
    • https://kimansion.com/uploads/file/pebadaramemofalawexokib.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/belixoxedemida.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/82114748278.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/67280653769.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/simotirakabipug.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109060600119586.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d591ba386a47aefdd16384770d0f24c8/jefajajeloxiwodogaxenav.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zaximuxusuzifexejakub.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/75892089702.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/mimawirop.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/15282915738.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/46705899673.pdfIn PDF document text
    • http://getdol.com/page_data/file/gunojanuzevizabun.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/67983800772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=apk+pro+editor+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 10140 bytes
SHA-256: 4beb860dde8961a45f015ac161f71d42b416b7d33a2cefa38365664002ff345a
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 17240 bytes
SHA-256: b41d5676351d94714162e28ce0cd4904cb87da4278fa67bb76e13004cf93097e